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AA, the name of a number of small rivers in central and northern Europe, derived from the Celtic ach, or Teutonic aa, flowing water. The most important are: I. A river of the Netherlands, province of North Brabant, which joins the Dommel at Bois-le-Duc. II. A river of Russia, government of Livonia, flowing into the gulf of Riga. III. A river of France, department of Le Nord, flowing into the North sea near Gravelines. IV. A river of Switzerland, canton of Aargau, which forms the lakes of Baldegg and Hallwyl, and flows into the Aar. V. A river of Switzerland, canton of Unterwalden, which flows through the lake of Sarnen, and empties into the lake of Lucerne.